{"product_id":"siemens-jj3s400-circuit-breaker","title":"Siemens | JJ3S400 | Circuit Breaker | 400A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing Siemens JJ3S400, a rugged, high-current circuit breaker engineered for demanding 3-phase power distributions. With a 400A rating across 3 poles and operation up to 600V, this unit is designed for maintenance, retrofit, and replacement projects where exact specifications matter.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 400A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePole configuration\u003c\/strong\u003e: 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating\u003c\/strong\u003e: 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number reference\u003c\/strong\u003e: JJ3S400 (best compatibility reference)\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy choose the Siemens JJ3S400 for your panel\u003c\/h3\u003e\n\u003cp\u003eAs a Siemens part, this breaker is built to align with Siemens distribution equipment and legacy 3-phase systems. It’s tailored for installations that require a precise match to existing protection schemes, ensuring seamless operation without the guesswork of mismatched replacements.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance replacements in commercial and industrial panels where 400A, 3-Pole, 600V protection is specified\u003c\/li\u003e \u003cli\u003eRetrofit projects upgrading older gear to modern Siemens-compatible protection\u003c\/li\u003e \u003cli\u003eNew installations that demand strict adherence to the JJ3S400 specification to maintain system coordination\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eHow this part solves your problems\u003c\/h3\u003e\n\u003cp\u003eWith the exact amperage, pole configuration, and voltage, it eliminates over- or under-protection risks. Rely on a proven Siemens design to minimize nuisance trips, protect expensive equipment, and keep power distribution running smoothly during service or upgrades.\u003c\/p\u003e \u003ch3\u003eCompatibility and ordering guidance\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, verify fit and ratings against your panel labeling and the equipment’s protection scheme. The JJ3S400 part number is your strongest reference for achieving a clean replacement or retrofit with minimal system disruption.\u003c\/p\u003e \u003ch3\u003eInstallation and safety notes\u003c\/h3\u003e\n\u003cp\u003eWiring and installation should be performed by a qualified electrical professional in accordance with all applicable safety standards. Ensure the main power is de-energized and follow manufacturer guidelines for torque, enclosure clearance, and proper bus bar engagement.\u003c\/p\u003e \u003ch3\u003eMaintenance and longevity tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eKeep spare JJ3S400 units on hand for planned maintenance windows to reduce downtime\u003c\/li\u003e \u003cli\u003eDocument the exact part number and panel location for future service cycles\u003c\/li\u003e \u003cli\u003eInspect surroundings for signs of wear or overheating during routine maintenance checks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46424361959586,"sku":"JJ3S400","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-jj3s400-circuit-breaker-400a-3-pole-600v-387.webp?v=1789344102","url":"https:\/\/www.ampstate.com\/products\/siemens-jj3s400-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}